Lined coolers for rotary kilns

ABSTRACT

A junction piece for use in rotary kilns of the type having a plurality of planetary cooler tubes is disclosed in which the lining of the junction piece includes, at least in part, sections of monolithic material.

United States Patent 1191 Andreassen Feb. 5, 1974 LINED COOLERS FORROTARY KILNS [56] References Cited [75] Inventor: Victor PaulAndreassen, UNITED STATES PATENTS c pen g y Denmark 3,502,311 3/1970Jensen 432/80 [731 Assigneei Smidth & Cresskilh 5382'235 31132; 5235531:.3'1: H85 2 [22] Filed: Apr. 7, 1972 e Primary Examiner-John J Camby[211 App]' 242313 Attorney, Agent, or Firm-Pennie & Edmonds [30] ForeignApplication Priority Data .[57] ABSTRACT Apr. 8, 1971 Great Britain9,077/7] A junction piece for use in rotary kilns of yp v having aplurality of planetary cooler tubes is dis- [22] ES. Cll. ...i$..7432/80closed in which the lining of the junction piece "t. C .v' 2 b l atleast in t on o mo l thic ateri Field of Search 432/80, 78, 252

7 Claims, 3 Drawing Figures PAIENTEU 51974 3. 790.335

' sum 1 or 2 LINED COOLERS FOR ROTARY KILNS BACKGROUND OF THE INVENTIONThis invention relates to rotary kilns of the type which are equippedwith cooler tubes arranged in planetary fasihion around the outlet endof the kiln for rotation with it to receive and cool the product such ascement clinker from the kiln by air flowing through the tubes incountercurrent to the product. These cooler tubes are generallyconnected to the kiln by radial chutes through which the product fallsand slides.

The kiln and the cooler tubes are formed by metal shells lined byheat-resisting material. At least in the hot end of each cooler tube thelining consists conventionally of fire bricks and is normallyinterrupted by iron sections which are welded to the walls of the tubeand abut against the sides of the adjacent bricks.

Now the hot ends of the cooler tubes are subjected in operation toconsiderable thermal and mechanical stresses, the thermal stressesarising from continually alternating heating and cooling, and themechanical stresses from the action of the hot product from the kiln,which partly slides down and partly falls into the cooler tubes. Atpoints where the fire bricks abut against the iron sections gaps areformed on cooling, and some of the kiln product may enter these gaps.When the temperature rises again the gaps tend to close and jam the kilnproduct, with the result that the brick lining breaks. Also, there is atendency for at least a part of the brick lining onto which the productfalls to be broken from time to time by the impact of the hot kilnproduct. These disadvantages of the conventional brick lining are wellknown, and they result in the need to stop the kiln and repair thedamaged lining from time to time.

SUMMARY OF THE INVENTION According to this invention each cooler tube isconnected to the kiln by a separate junction piece registering at oneend with an opening in the kiln and being secured at the other end tothe cooler tube proper, part at least of the lining of each junctionpiece being monolithic.

The monolithic lining consists of a mass of heatresistant material castor tamped into position and hydraulically or chemically set. When thehot end of each cooler tube and the chute connecting it to the kiln havebeen united so as to form a separate junction piece the object has beento facilitate the provision of such monolithic lining, before thejunction piece is connected to the cooler tube proper and to the kiln.

The mass forming the monolithic lining may advantageously be anchored inposition by being reinforce welded to the shell of the junction pieceand embedded in the mass.

The whole lining mayadvantageously be monolithic, since although it maynot have the mechanical strength of a fire brick it will resist wearingdown for a longer time than a fire brick lining will resist destructionby crushing. However, the lining may be composite. In

. other words, it may consist, in part, of sections of fire bricksinterrupted by monolithic sections which allow of expansion orcontraction of the fire brick sections without presenting thedisadvantage that gaps open between them and the fire bricksections oncooling.

The monolithic mass may be composed of any suitable refractory material,for example, sand or crushed brick, and may be set hydraulically, inwhich case aluminous cement may advantageously be used as a bindingagent, or may be set chemically, in which case phosphoric acid mayadvantageously be used as the binding agent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows diagrammatically part ofa kiln and some planetary cooling tubes;

FIG. 2 is a diagrammatic section on the line 2-2 in FIG. 1; and,

FIG. 3 is a cross-section on the line 3-3 in FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1.shows the generalarrangement of typical planetary cooler tubes spaced around a kiln 1. Asshown in FIG. 2, the kiln 1 has openings 17 in its wall and hollowspigots 2 around these openings. Junction pieces 3, each including aradial chute 4, are mounted to register with the openings 17, and, eachjunction piece also includes a part 18 'with a mouth that registers withthe corresponding cooler tube.

The cooler tube 5 is lined by fire brick 6, and it has an end flange 19which mates with a corresponding flange 20 on the junction piece 3, thejunction piece being held firmly in position by bolts passing throughthe flanges 19 and 20. The kiln shell 7 is lined by fire brick 8, andthe opening 17 is similarly lined by fire brick 21. The junction pieceis not actually secured to the spigot 2, but its end lies within a ring22 which is bolted to the spigot 2, the arrangement permitting radialexpansion and contraction of the chute 4 on heating and cooling. At,what may be regarded as the corner 23 the junction piece presents aflat lens-shaped surface externally.

The junction piece shown is lined partly monolithically and partly offire brick. Fire brick sections are indicated generally by referencenumerals 9, 10, 11 and 12, and monolithic sections by reference numeral13. In FIG. 3 the parts of the lining that consist of fire brick andthat are visible to the eye of an observer at the section line 3-3 areindicated by intersecting lines, while those parts that are monolithicare shown plain. Iron reinforcement members 14, 15 and 16 are welded tothe shell of the junctionpiece and embedded in the adjacent monolithicmaterial.

In forming the lining it is advantageous to put the fire brick sectionsin position first and to retain them by shallow flat irons 24 before andduring the casting of the monolithic sections. These irons 24 becomewholly embedded in the adjacent monolithic material.

While with the construction shown in the drawings the lining is acomposite one comprising partly fire brick and partly a monolithicmaterial, it is to be recognized that the entire lining may bemonolithic.

I claim:

1. In a rotary kiln of the cooler tubes arranged in a planetary fashionaround the outlet end of the kiln for rotation with the kiln, at leastone junction piece having first and second open ended sectionssubstantially perpendicular to each other, said first section beingflanged and secured by bolt means to the corresponding cooler tube withthe open end in communication therewith, and said second sectioncommunicates with an opening in the kiln and extends substantiallyradially from the kiln to the first section type having a plurality of 4monolithic sections of the lining.

5. The junction piece according to claim 3 including retaining membersfor the fire brick sections of the lining embedded in the adjacentmonolithic material.

6. The junction piece according to claim 2 including at least onereinforcement member embedded in the monolithic sections of the lining.

7. The junction piece according to claim 4 including retaining membersfor the fire brick sections of the lining embedded in the adjacentmonolithic material.

I i I I v

1. In a rotary kiln of the type having a plurality of cooler tubesarranged in a planetary fashion around the outlet end of the kiln forrotation with the kiln, at least one junction piece having first andsecond open ended sections substantially perpendicular to each other,said first section being flanged and secured by bolt means to thecorresponding cooler tube with the open end in communication therewith,and said second section communicates with an opening in the kiln andextends substantially radially from the kiln to the first section in amanner which permits radial expansion and contraction of said secondsection, said junction piece having at least a portion thereof linedwith monolithic material.
 2. The junction piece according to claim 1 inwhich the entire lining is monolithic.
 3. The junction piece accordingto claim 1 wherein a portion of the lining includes sections of firebricks spaced apart by sections of monolithic material.
 4. The junctionpiece according to claim 3 including at least one reinforcement memberembedded in the monolithic sections of the lining.
 5. The junction pieceaccording to claim 3 including retaining members for the fire bricksections of the lining embedded in the adjacent monolithic material. 6.The junction piece according to claim 2 including at least onereinforcement memBer embedded in the monolithic sections of the lining.7. The junction piece according to claim 4 including retaining membersfor the fire brick sections of the lining embedded in the adjacentmonolithic material.